Summary

William J. Brennan, Jr. Blystone v. Pennsylvania — Dissenting Opinion

Just as a jury must be free to consider and weigh mitigating circumstances as independently relevant to the defendant's moral culpability, see Penry, supra, at 319, 109 S.Ct., at 2947, a jury must also be able to consider and weigh the severity of each aggravating circumstance. The weight of an aggravating circumstance depends on the seriousness of the crime-a significant aspect of the defendant's moral culpability. Thus, a reasoned moral response to the defendant's conduct requires the consideration of the significance of both aggravating and mitigating factors.
Source: Wikisource

William J. Brennan, Jr. Blystone v. Pennsylvania — Dissenting Opinion

Indeed, the prosecutor argued that because the jury had already found an aggravating circumstance by finding petitioner guilty of robbery, the statute mandated that the death penalty be imposed unless the defendant proved at least one mitigating circumstance.
"Our law doesn't permit the jury to impose the death penalty or impose a life sentence as they feel it should be, but rather there are certain specific times when the death penalty should be imposed and there are certain specific times when it should not be imposed.
Source: Wikisource

William J. Brennan, Jr. Blystone v. Pennsylvania — Dissenting Opinion

As the majority fails to recognize, under the Pennsylvania statute an aggravating circumstance does much more than "channel" the jury's discretion: in the absence of mitigating factors, it mandates the death penalty.
This Court has never held that a legislature may mandate the death sentence for any category of murderers. Instead, a legislature's role must be limited to the definition of the class of death-eligible defendants. A legislature does not, and indeed cannot, consider every possible fact pattern that technically will fall within an aggravating circumstance.
Source: Wikisource

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